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INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Fair value |  |
Less than 12 months | $ 4,900.2 | $ 1,864.0
12 months or greater | 4,801.9 | 5,964.9
Total | 9,702.1 | 7,828.9
Unrealized losses |  |
Less than 12 months | (98.6) | (58.5)
12 months or greater | (797.5) | (836.7)
Total | (896.1) | (895.2)
Corporate securities |  |
Fair value |  |
Less than 12 months | 2,486.7 | 734.9
12 months or greater | 1,816.2 | 2,645.8
Total | 4,302.9 | 3,380.7
Unrealized losses |  |
Less than 12 months | (74.7) | (44.3)
12 months or greater | (387.3) | (426.7)
Total | (462.0) | (471.0)
United States Treasury securities and obligations of United States government corporations and agencies |  |
Fair value |  |
Less than 12 months | 22.6 | 0.4
12 months or greater | 155.0 | 153.9
Total | 177.6 | 154.3
Unrealized losses |  |
Less than 12 months | (0.2) | 0.0
12 months or greater | (32.4) | (30.2)
Total | (32.6) | (30.2)
States and political subdivisions |  |
Fair value |  |
Less than 12 months | 293.7 | 275.6
12 months or greater | 879.4 | 806.0
Total | 1,173.1 | 1,081.6
Unrealized losses |  |
Less than 12 months | (10.7) | (8.5)
12 months or greater | (147.6) | (127.6)
Total | (158.3) | (136.1)
Foreign governments |  |
Fair value |  |
Less than 12 months | 7.2 | 3.1
12 months or greater | 10.1 | 24.3
Total | 17.3 | 27.4
Unrealized losses |  |
Less than 12 months | (0.1) | 0.0
12 months or greater | (2.1) | (2.7)
Total | (2.2) | (2.7)
Asset-backed securities |  |
Fair value |  |
Less than 12 months | 789.2 | 187.8
12 months or greater | 409.9 | 487.7
Total | 1,199.1 | 675.5
Unrealized losses |  |
Less than 12 months | (5.5) | (1.8)
12 months or greater | (42.5) | (44.9)
Total | (48.0) | (46.7)
Agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 147.9 | 59.8
12 months or greater | 6.6 | 13.8
Total | 154.5 | 73.6
Unrealized losses |  |
Less than 12 months | (0.8) | 0.0
12 months or greater | (0.1) | (0.2)
Total | (0.9) | (0.2)
Non-agency residential mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 205.9 | 131.4
12 months or greater | 563.9 | 703.3
Total | 769.8 | 834.7
Unrealized losses |  |
Less than 12 months | (2.2) | (0.9)
12 months or greater | (76.2) | (90.0)
Total | (78.4) | (90.9)
Collateralized loan obligations |  |
Fair value |  |
Less than 12 months | 481.0 | 227.3
12 months or greater | 46.9 | 62.9
Total | 527.9 | 290.2
Unrealized losses |  |
Less than 12 months | (1.1) | (0.9)
12 months or greater | (1.5) | (1.8)
Total | (2.6) | (2.7)
Commercial mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 466.0 | 243.7
12 months or greater | 913.9 | 1,067.2
Total | 1,379.9 | 1,310.9
Unrealized losses |  |
Less than 12 months | (3.3) | (2.1)
12 months or greater | (107.8) | (112.6)
Total | $ (111.1) | $ (114.7)

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